比如说，如果我使用 Visual Studio 从 C++/MFC 项目中的资源创建对话框窗口，我可以从资源编辑器更改对话框字体和大小。我的问题是如何从程序中做同样的事情？
这是几个屏幕截图：
常规尺寸：
尺寸 14：
PS。我可以想象，一旦创建了对话框窗口，就无法更改字体大小，但是在创建之前呢？
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10136 次
3 回答
3
尚未对此进行测试，但您似乎可以使用 WinAPI SendDlgItemMessage：
hFont = // obtain handle to a font object
SendDlgItemMessage(hwnd, IDC_OF_YOUR_CONTROL, WM_SETFONT, (WPARAM)hfFont, TRUE);
替换IDC_OF_YOUR_CONTROL为 dialag 的标识符。创建 12pt“Times New Roman”字体的示例代码：
HFONT hf;
HDC hdc;
long lfHeight;
hdc = GetDC(NULL);
lfHeight = -MulDiv(12, GetDeviceCaps(hdc, LOGPIXELSY), 72);
ReleaseDC(NULL, hdc);
hf = CreateFont(lfHeight, 0, 0, 0, 0, TRUE, 0, 0, 0, 0, 0, 0, 0, "Times New Roman");
来源：http ://winprog.org/tutorial/fonts.html
编辑：我不知道这些 WinAPI 调用如何映射到 MFC，但可能有类似的方法可用。
于 2013-01-17T00:50:39.220 回答
3
哇，没想到这么复杂。这是我想出的更改字体大小和字体的解决方案。它适用于任何对话框，无需调整单个对话框控件的大小：
对于 MFC 项目：
//Header .h file
static INT_PTR OpenDialogWithFont(CWnd* pParentWnd, LPCTSTR lpszResourceID, LPCTSTR pstrFontFaceName = NULL, WORD wFontPtSz = 0, BOOL* pbOutResultFontApplied = NULL);
static BYTE* AdvanceThrough_sz_Or_Ord(BYTE* pData);
static BYTE* AdvanceThrough_String(BYTE* pData, CString* pOutStr = NULL);
然后是实现本身：
INT_PTR OpenDialogWithFont(CWnd* pParentWnd, LPCTSTR lpszResourceID, LPCTSTR pstrFontFaceName, WORD wFontPtSz, BOOL* pbOutResultFontApplied)
{
//Open dialog box with the 'lpszResourceID'
//'pParentWnd' = parent window class
//'pstrFontFaceName' = Font face name to use, or NULL to use original font
//'wFontPtSz' = point size of the font, or 0 to use original font size
//'pbOutResultFontApplied' = if not NULL, receives TRUE if font was applied, or FALSE if dialog was shown with original font
//RETURN:
// = One of the values returned by CDialog::DoModal
INT_PTR nResDlg = -1;
BOOL bAppliedFont = FALSE;
BYTE* pCNewData = NULL;
LPCTSTR m_lpszTemplateName = MAKEINTRESOURCE(lpszResourceID);
HINSTANCE hInst = AfxFindResourceHandle(m_lpszTemplateName, RT_DIALOG);
if(hInst)
{
HRSRC hResource = ::FindResource(hInst, m_lpszTemplateName, RT_DIALOG);
HGLOBAL hDialogTemplate = LoadResource(hInst, hResource);
if(hDialogTemplate)
{
LPCDLGTEMPLATE lpDialogTemplate = (LPCDLGTEMPLATE)LockResource(hDialogTemplate);
DWORD dwszDialogTemplate = SizeofResource(hInst, hResource);
if(lpDialogTemplate &&
dwszDialogTemplate)
{
//Template to use
LPCDLGTEMPLATE lpDialogTemplateToUse = lpDialogTemplate;
//See if it's an extended dialog structure
DLGTEMPLATEEX_PART1* pDTX1 = (DLGTEMPLATEEX_PART1*)lpDialogTemplate;
if(pDTX1->signature == 0xFFFF &&
pDTX1->dlgVer == 1)
{
//Now get thru variable length elements
BYTE* pData = (BYTE*)(pDTX1 + 1);
//sz_Or_Ord menu;
pData = AdvanceThrough_sz_Or_Ord(pData);
//sz_Or_Ord windowClass;
pData = AdvanceThrough_sz_Or_Ord(pData);
//title
CString strTitle;
pData = AdvanceThrough_String(pData, &strTitle);
//Now pointsize of the font
//This member is present only if the style member specifies DS_SETFONT or DS_SHELLFONT.
if(pDTX1->style & (DS_SETFONT | DS_SHELLFONT))
{
//Font size in pts
BYTE* pPtr_FontSize = pData;
WORD ptFontSize = *(WORD*)pData;
pData += sizeof(WORD);
WORD wFontWeight = *(WORD*)pData;
pData += sizeof(WORD);
BYTE italic = *(BYTE*)pData;
pData += sizeof(BYTE);
BYTE charset = *(BYTE*)pData;
pData += sizeof(BYTE);
//Font face name
CString strFontFaceName;
BYTE* pPtr_FontFaceName = pData;
pData = AdvanceThrough_String(pData, &strFontFaceName);
//Remember the end of the struct (that we care about)
BYTE* pPtr_EndStruct = pData;
//Get size of the end data chunk
int ncbszEndChunk = dwszDialogTemplate - (pPtr_EndStruct - (BYTE*)lpDialogTemplate);
if(ncbszEndChunk >= 0)
{
//Now we can modify the struct
//Get new type face name (or use the old one)
CString strNewFontFaceName = pstrFontFaceName ? pstrFontFaceName : strFontFaceName;
//Calculate the new struct size
int ncbSzNewData = dwszDialogTemplate -
strFontFaceName.GetLength() * sizeof(WCHAR) +
strNewFontFaceName.GetLength() * sizeof(WCHAR);
//Reserve mem
pCNewData = new BYTE[ncbSzNewData];
if(pCNewData)
{
BYTE* pNewData = pCNewData;
//Copy in chunks
memcpy(pNewData, lpDialogTemplate, pPtr_FontFaceName - (BYTE*)lpDialogTemplate);
pNewData += pPtr_FontFaceName - (BYTE*)lpDialogTemplate;
//Then put our font face name
memcpy(pNewData, strNewFontFaceName.GetString(), (strNewFontFaceName.GetLength() + 1) * sizeof(WCHAR));
pNewData += (strNewFontFaceName.GetLength() + 1) * sizeof(WCHAR);
//And add the ending chunk
memcpy(pNewData, pPtr_EndStruct, ncbszEndChunk);
pNewData += ncbszEndChunk;
//Check memory allocation
if(pNewData - pCNewData == ncbSzNewData)
{
//Are we setting the font size?
if(wFontPtSz != 0)
{
WORD* pwFontSz = (WORD*)(pCNewData + (pPtr_FontSize - (BYTE*)lpDialogTemplate));
if(*pwFontSz != wFontPtSz)
{
//Set flag
bAppliedFont = TRUE;
}
//Set new font size
*pwFontSz = wFontPtSz;
}
//Did we have a specified font face too
if(pstrFontFaceName)
bAppliedFont = TRUE;
//Use our adjusted template
lpDialogTemplateToUse = (LPCDLGTEMPLATE)pCNewData;
}
else
{
ASSERT(NULL);
}
}
}
}
}
//Try to load it from the template
CDialog abt;
if(abt.InitModalIndirect(lpDialogTemplateToUse, pParentWnd))
{
//And show the modal dialog
nResDlg = abt.DoModal();
}
}
}
}
//Free memory
if(pCNewData)
{
delete[] pCNewData;
pCNewData = NULL;
}
if(pbOutResultFontApplied)
*pbOutResultFontApplied = bAppliedFont;
return nResDlg;
}
自定义结构定义：
#pragma pack(push, 1) // exact fit - no padding
struct DLGTEMPLATEEX_PART1{
WORD dlgVer;
WORD signature;
DWORD helpID;
DWORD exStyle;
DWORD style;
WORD cDlgItems;
short x;
short y;
short cx;
short cy;
};
#pragma pack(pop)
这是解析可变大小成员的辅助方法：
BYTE* AdvanceThrough_sz_Or_Ord(BYTE* pData)
{
//'pData' = Points to a variable-length array of 16-bit elements that identifies a menu
// resource for the dialog box. If the first element of this array is 0x0000,
// the dialog box has no menu and the array has no other elements. If the first
// element is 0xFFFF, the array has one additional element that specifies the
// ordinal value of a menu resource in an executable file. If the first element
// has any other value, the system treats the array as a null-terminated Unicode
// string that specifies the name of a menu resource in an executable file.
//RETURN:
// = Following address
ASSERT(pData);
WORD* pWArr = (WORD*)pData;
if(*pWArr == 0x0000)
{
//No other elements
pWArr++;
}
else if(*pWArr == 0xFFFF)
{
//Next element is menu ID
pWArr++;
pWArr++;
}
else
{
//Unicode ASIIZ string
WCHAR z;
do
{
z = *pWArr;
pWArr++;
}
while(z != 0);
}
return (BYTE*)pWArr;
}
BYTE* AdvanceThrough_String(BYTE* pData, CString* pOutStr)
{
//'pData' = Points to null-terminated Unicode string
//'pOutStr' = if not NULL, receives the string scanned
//RETURN:
// = Pointer to the first BYTE after the string
ASSERT(pData);
WCHAR* pWStr = (WCHAR*)pData;
WCHAR z;
do
{
z = *pWStr;
pWStr++;
}
while(z != 0);
if(pOutStr)
{
int nLn = pWStr - (WCHAR*)pData;
memcpy(pOutStr->GetBufferSetLength(nLn), pData, nLn * sizeof(WCHAR));
pOutStr->ReleaseBuffer();
}
return (BYTE*)pWStr;
}
这就是你所说的：
BOOL bResAppliedFontCorrection;
int nResultDlg = OpenDialogWithFont(this,
MAKEINTRESOURCE(IDD_ABOUTBOX),
_T("Algerian"),
16,
&bResAppliedFontCorrection);
对于那些对其工作原理感兴趣的人，该方法会在创建对话框之前修改对话框模板结构，从而让操作系统完成所有字体操作。
于 2013-01-17T21:14:20.993 回答
0
正如我在评论中指出的那样，您尝试做的事情不会特别容易。有许多角落案例和小东西会回来咬你。
但是，如果您仍然想尝试，您可以使用CWnd::SetFont更改对话框子窗口的字体。只需构建您要使用的字体，将其分配给适当的控件，然后 tada。
祝你好运...
于 2013-01-17T00:51:08.147 回答